Fixed blown sparkplug but now i'm Idle surging. help

[TheMarkedOne]

Was driving my si for about 10 minutes and wanted to see how high my knock control and misfire counts were and I am not entirely sure if having .57 control and 48 misfires in cylinder 1 is a particularly bad thing or not.

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[mauiSI19]

Was driving my si for about 10 minutes and wanted to see how high my knock control and misfire counts were and I am not entirely sure if having .57 control and 48 misfires in cylinder 1 is a particularly bad thing or not.

That should have thrown a CEL...it didn’t ?

the car is not running rough ?

 

[TheMarkedOne]

It didn't throw any codes and the car runs albeit a rough idle now. I don't know what's going on but I did see the knock control shoot up to 1 driving to school today. Very concerned with that and how many misfire counts my cylinder 1 is getting.

 

[TheMarkedOne]

That should have thrown a CEL...it didn’t ?

the car is not running rough ?

It's running a bit rough. In a couple hours I'm going to check the plugs, gap and the ohms of my coils if they are all okay.

 

[TheMarkedOne]

I switched the coils in cylinder 1 and 2 to see if that changed the problem and it did not. So I took out the spark plugs in all the cylinders to compare them and low and behold. My cylinder 1 plug was blown. Afterwards I replaced the sparks with ngk sparks and the immediate misfiring has disappeared or slowed down. But now I have another problem. Every time I start the car cold the idle surges from 1k rpm to 2k rpm for along time until it's warm again then it starts to settle. Also it still misfires but only during idle or low rpms in cylinder 1. I am not entirely sure what is happening any suggestions?

 

[TheMarkedOne]

Okay I have provided a log of the surging here. I notice my AFR going crazy so I'm going to recheck my fitment of my air intake.https://www.mediafire.com/file/v0nnz1a472lpq8p/Idle_Surging.kdlg/file

 

[D-RobIMW]

Mark,

I see you're local; hi!

Anyway, if you've killed a spark plug, you're going to want to perform a leakdown test to see if you damaged a valve (while the porcelain made it's exit from the chamber). Also, if you're killing the spark plug, consider having the injectors replaced.

 

[TheMarkedOne]

Mark,

I see you're local; hi!

Anyway, if you've killed a spark plug, you're going to want to perform a leakdown test to see if you damaged a valve (while the porcelain made it's exit from the chamber). Also, if you're killing the spark plug, consider having the injectors replaced.

Where can I perform a leakdown test? Can I come by your shop?

 

[TheMarkedOne]

Might want to check and replace the valves now.

 

[D-RobIMW]

Mark,

Yeah, I can check the car out sometime, if you'd like. Just give the shop a call during business hours.

If the car is under warranty, I would consider returning to stock and having Rahal diagnose, as well.

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